Cleanup ticks and tags in method docs.
Tweak `support.nonEnumArgs` assignment.
Another round of type coercion cleanup.
Fix Underscore build of `range` with a `step` of `0`.
Allow `null` or `undefined` elements in `pluck`, `property`, and `invoke`.
Avoid returning `assignDefaults` if no `object` is provided to `defaults`.
Comment nits.
Add `baseFind` to simplify `find`, `findLast`, `findKey`, `findLastKey`.
Clarify `isEmpty`.